EFIVARFS

To use efibootmgr 0 and other software to manipulate the UEFI boot entries, the efivars filesystem must be mounted. This isn’t handled automatically by KISS due to the security implications in doing so. 1

# Mount efivars.
$ mount -t efivarfs none /sys/firmware/efi/efivars/

# Unmount efivars.
$ umount /sys/firmware/efi/efivars/